Publication Date:
2022-08-26
Description:
Reconstruction of geomagnetic field changes has a strong potential to complement geodynamo modeling and improve the understanding of Earth’s core dynamics. Recent works based on geomagnetic measure-ments pointed out that over the last two decades the position of the north magnetic pole has been largely determined by the influence of two competing flux lobes under Canada and Siberia.
In order to understand if the waxing and waning of magnetic flux lobes have driven the path of geo-magnetic paleopoles in the past, we present an augmented and updated record of the chronology and paleosecular variation of geomagnetic field for the last 22 kyr derived from sedimentary cores collected along the north-western margin of Barents Sea and western margin of Spitsbergen (Arctic). The path of the virtual geomagnetic pole (VGP) has been reconstructed over this time period and compared with the maps of the radial component of the geomagnetic field at the core-mantle boundary, obtained from the most recent models. The VGP path includes centuries during which the VGP position is stable and cen-turies during which its motion accelerates. We recognize both clockwise and counterclockwise VGP paths, mostly developing inside the surface projection of the inner core tangent cylinder in the Arctic region. The VGP path seems to follow the appearance of Brpatches of normal magnetic flux, especially those located under Siberia and Canada areas, but also those that may cause peculiar paleomagnetic features such as the Levantine Iron Age Anomaly.
Description:
Published
Description:
117762
Description:
1A. Geomagnetismo e Paleomagnetismo
Description:
5A. Ricerche polari e paleoclima
Description:
JCR Journal
Keywords:
geomagnetic paleosecular variation
;
relative paleointensit
;
flux lobes
;
Levantine Iron Age Anomaly
;
marine sediment cores
;
arctic region
;
solid earth
;
paleomagnetism
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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